Drinking water quality · 2025
· Verified
What's in Mesa Del Toro Mwc, CA tap water
9 contaminants were measured in the Mesa Del Toro Mwc, CA water system's 2025 annual report. Each is shown below against its federal limit — 1 sit at or above that limit.
- Reporting year
- 2025
- Contaminants measured
- 9
- Over federal limit
- 1
- Approaching the limit
- 0
- Worst contaminant
- Manganese
- Service area
- CA
Where your water comes from · EPA SDWIS
Mesa Del Toro Mwc, CA's drinking water comes from ground water, drawn from 2 sources.
Source
- WELL
- WELL 02
Treatment
Distribution
Historical readings · EPA Six-Year Review (2012–2019)
1 contaminant historically over EPA limits in Mesa Del Toro Mwc, CA
Every U.S. public water system reports compliance-monitoring data to EPA. The Six-Year Review releases the 2012–2019 window as a single dataset — here's what your system reported, year by year. Values shown are the highest detection per analyte per year, compared to the federal MCL.
| Contaminant | Worst detection | EPA limit | Years (2012–2019) |
|---|---|---|---|
ARSENIC worst: 2014 | 0.03 mg/L 3.0× 2.3× the national p90 | 0.01 mg/L | '12'13'14'15 |
FLUORIDE worst: 2012 | 0.33 mg/L within | 4 mg/L | '12'17 |
NITRATE worst: 2013 | 0.678 mg/L within | 10 mg/L | '13 |
CHROMIUM worst: 2017 | 0.004 mg/L within below national p90 | 0.1 mg/L | '17 |
SELENIUM worst: 2017 | 0.001 mg/L within | 0.05 mg/L | '17 |
BARIUM worst: 2017 | 0.026 mg/L within below national p90 | 2 mg/L | '17 |
TOLUENE worst: 2014 | 0.00075 mg/L within | 1 mg/L | '14 |
COPPER worst: 2017 | 0.003 mg/L below national p90 | — | '17 |
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| ManganeseA naturally occurring metal from soil and rock. | 468.75 UG/LAverageSource water | 50 UG/LMCL | At or above the limit |
| LeadA toxic metal that leaches into water from old service lines, solder, and plumbing fixtures. | 3.7 UG/L90th percentileDistribution | 15 UG/LAl | Within the limit |
Physical & aggregate
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Total Dissolved SolidsTotal dissolved solids — the combined content of all dissolved minerals and salts. | 788 MG/LAverageSource water | 1000 MG/LMCL | Within the limit |
| Specific ConductanceA measure of how well water conducts electricity, which tracks dissolved mineral content. | 1234.75 UMHO/CMAverageSource water | 1600 UMHO/CMMCL | Within the limit |
Radionuclides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Gross AlphaGross alpha particle activity — a combined measure of alpha-emitting radioactive substances. | 4.205 PCI/LAverageSource water | 15 PCI/LMCL | Within the limit |
| Combined RadiumCombined radium-226 and radium-228 — naturally occurring radioactive elements. | 0.36966666666666664 PCI/LAverageSource water | 5 PCI/LMCL | Within the limit |
| UraniumA naturally occurring radioactive metal from erosion of natural deposits. | Not detected PCI/LHighest single sampleSource water | 20 PCI/LMCL | None detected |
People also ask about Mesa Del Toro Mwc, CA's water
+Is Mesa Del Toro Mwc, CA tap water safe to drink in 2025?
The 2025 Consumer Confidence Report for the Mesa Del Toro Mwc, CA water utility lists 1 contaminant at or above the federal limit: Manganese. Whether that means the water is "unsafe" depends on which contaminant, how long the exposure, and individual health factors. The table on this page shows the measured value, the federal threshold, and the regulated statistic used for compliance.
+What contaminants are in Mesa Del Toro Mwc, CA tap water?
9 contaminants were measured in Mesa Del Toro Mwc, CA's 2025 Consumer Confidence Report, spanning metals, radionuclides, and physical & aggregate. 9 have an enforceable federal limit; the rest are detected but unregulated. Every measured value, in the utility's own units, is on this page.
+Which contaminants exceed federal limits in Mesa Del Toro Mwc, CA tap water?
One contaminant in Mesa Del Toro Mwc, CA's 2025 report sits at or above the federal limit: Manganese (9.4× the limit). The EPA enforces these limits against the regulated reporting statistic — typically a running annual average or 90th percentile — not a one-off sample spike.
+What is the worst contaminant in Mesa Del Toro Mwc, CA tap water?
The contaminant with the highest measured value relative to its federal limit in the 2025 report is Manganese, at 9.4× the federal threshold. It belongs to the metals family of contaminants.
+Where does the data on this page come from?
Every value is transcribed from Mesa Del Toro Mwc, CA's 2025 Consumer Confidence Report — the annual drinking-water report every U.S. public water utility is required by federal law to publish. The original source document is archived and viewable on this site. A water-quality report covers an entire service area, not a single address.
+How often is Mesa Del Toro Mwc, CA's water quality data updated?
Each U.S. public water utility publishes one Consumer Confidence Report per year, covering the prior calendar year's measurements. This page reflects the 2025 report; a new report will replace it once the utility publishes its next annual update.